diff options
| -rw-r--r-- | lib/vsprintf.c | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index e966a45e2f00..e35724c2b2a8 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -1772,14 +1772,14 @@ qualifier: case 'n': /* - * Since %n poses a greater security risk than utility, treat - * it as an invalid format specifier. Warn about its use so - * that new instances don't get added. + * Since %n poses a greater security risk than + * utility, treat it as any other invalid or + * unsupported format specifier. */ - WARN_ONCE(1, "Please remove ignored %%n in '%s'\n", fmt); /* Fall-through */ default: + WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt); spec->type = FORMAT_TYPE_INVALID; return fmt - start; } @@ -1920,10 +1920,15 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) break; case FORMAT_TYPE_INVALID: - if (str < end) - *str = '%'; - ++str; - break; + /* + * Presumably the arguments passed gcc's type + * checking, but there is no safe or sane way + * for us to continue parsing the format and + * fetching from the va_list; the remaining + * specifiers and arguments would be out of + * sync. + */ + goto out; default: switch (spec.type) { @@ -1968,6 +1973,7 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) } } +out: if (size > 0) { if (str < end) *str = '\0'; @@ -2165,9 +2171,10 @@ do { \ switch (spec.type) { case FORMAT_TYPE_NONE: - case FORMAT_TYPE_INVALID: case FORMAT_TYPE_PERCENT_CHAR: break; + case FORMAT_TYPE_INVALID: + goto out; case FORMAT_TYPE_WIDTH: case FORMAT_TYPE_PRECISION: @@ -2229,6 +2236,7 @@ do { \ } } +out: return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; #undef save_arg } @@ -2351,12 +2359,14 @@ int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) break; case FORMAT_TYPE_PERCENT_CHAR: - case FORMAT_TYPE_INVALID: if (str < end) *str = '%'; ++str; break; + case FORMAT_TYPE_INVALID: + goto out; + default: { unsigned long long num; @@ -2399,6 +2409,7 @@ int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) } /* switch(spec.type) */ } /* while(*fmt) */ +out: if (size > 0) { if (str < end) *str = '\0'; |